K L Baluja
Articles written in Pramana – Journal of Physics
Volume 43 Issue 6 December 1994 pp 477-485
Systematic trends in the line strengths of E1 transitions in the oxygen isoelectronic sequence
Line strengths
Volume 45 Issue 6 December 1995 pp 533-536 Research Articles
Relativistic correction to the dipole polarizability of a hydrogenic ion
The first relativistic correction of order
Volume 45 Issue 6 December 1995 pp 537-543 Research Articles
Line strength
Volume 46 Issue 6 June 1996 pp 431-449
Positron scattering from hydrocarbons
The total cross sections for positron impact on hydrocarbons have been calculated using the additivity rule in which the total cross section for a molecule is the sum of the total cross section for the constituent atoms. The energy range considered is from a few eV to several thousand eV. The total cross sections for positron impact on an atom are calculated by employing a complex spherical potential which comprises of a static, polarization and an absorption potential. We have good agreement with the experimental results for hydrocarbons for positron energy ⩾100 eV. Our results also agree with the available calculations for CH_{4} and C_{2}H_{2} which employed full molecular wavefunctions beyond 100 eV. Our absorption cross sections also agree with molecular wave-function calculations for C_{2}H_{2} and CH_{4} beyond 100 eV. We have shown the Bethe plots for
Volume 47 Issue 1 July 1996 pp 87-98 Research Articles
Positron scattering from alkaline-earth elements
The total (elastic + inelastic) cross sections for
Volume 54 Issue 3 March 2000 pp 377-384 Research Articles
Transition amplitudes and transition probabilities for the two-photon 1
Volume 88 Issue 5 May 2017 Article ID 0076 Research Article
Rate coefficients of open shell molecules and radicals: $R$-matrix method
JASMEET SINGH K L BALUJA GAGANDEEP LONGIANY
The open shell molecules with even number of electrons have $\pi^2$ or $\pi^{2}_{g}$ ground-state electronic configuration. Several homonuclear diatomic molecules like $\rm{O_2, S_2, B_2}$ have $\pi^{2}_{g}$ ground state in the $D_{\infty h}$ point group and heteronuclear diatomic radicals like PH, NH, SO have $\pi^2$ ground state in the $C_{\infty v}$ point group. We have computed and presented here the rate coefficient of these open shell molecules $\rm{(O_2, S_2, B_2)}$ and radicals (PH, NH,SO) from the results of our previous studies using a well-established $\it {ab-initio}$ formalism: the $R$-matrix method. The rate coefficients for elastic and electron-excited processes are studied over a wide electron temperature range.
Volume 89 Issue 2 August 2017 Article ID 0030 Research Article
Low-energy electron impact cross-sections and rate constants of $NH_2$
ANAND BHARADVAJA SAVINDER KAUR K L BALUJA
This systematic study reports various electron impact cross-sections, rate constants and transport properties of $NH_2$ radical in the low-energy limit. The collision study is based on $R$-matrix formalism and involves the use of various scattering models employing different active spaces. Both electron excited inelasticcross-sections and resonances are found influenced by correlation and polarization effects. The non-relativistic molecular bremsstrahlung radiation cross-section for soft photons, binary encounter Bethe model-based ionization cross-sections and a few molecular properties of the target radical are also reported. The present calculations are found to be in agreement with the available results. This theoretical study provides a pathway to understand collision dynamics and generates data required in various fields of applied physics.
Volume 94 All articles Published: 7 May 2020 Article ID 0073 Research Article
ANAND BHARADVAJA SAVINDER KAUR K L BALUJA
The amines are major source of environment pollutants emitted in atmosphere from variousanthropogenic sources. The non-thermal plasma (NTP)-based technology has proved successful in controlling the emitted amines reaching the atmosphere. The efficient NTP reactors rely on accurate electron–molecule collision data. The electron impact cross-sections are thus obtained for a few amines from ionisation threshold to 5000 eV using the single centre expansion (SCE) formalism. Themolecular wave function of each target is obtained from themulticentre expansion of the Gaussian-type orbitals within a single determinant Hartree–Fock self-consistent field scheme. The expansion of wave function, density and potential is carried out at the centre of mass of the molecules. The interaction potential included to model the electron interaction in the target comprises static, correlation polarisation and exchange types of potentials. The elastic cross-sections are obtained after solving the coupled scattering equations using Volterra integral form. The inelastic effects contributing to electron–molecule scatteringare approximated by the ionisation cross-sections. The total cross-sections obtained after summing the elastic and ionisation cross-sections are in good agreement with the available data. We have also tried to explain the effect of polarisation potential on scattering cross-sections. A semiempirical formula based on the spatial extent of the molecule is proposed to estimate the cross-sections for the homologous series of amine molecules.
Volume 94, 2020
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